Pediatric patients who need antibiotics are often prescribed penicillin, the study authors noted. Prior research in adults has suggested that allergies to penicillin could be a signal for additional allergies to other medications.

But in the new study, which included an analysis of 778 medical records from patients under the age of 18, of the 8 percent of children who had a positive skin test for penicillin allergy, just 21 percent were found to have allergies to additional drugs. In comparison, 23 percent of those with negative penicillin skin tests displayed multiple drug allergies.

I've always suspected his was a developed allergy. With penicillin, they reacted day three of their first prescription. But, the one son who was on antibiotics often, eventually had a bad reaction. Not anaphylactic, but all over body hives that lasted days.

(Thank goodness it wasn't anahylactic. It was before I developed my allergies, and I didn't realize how serious that reaction could have been.)

_________________self: allergy to sesame seeds and peanuts
3 sons each with at least one of the following allergies: peniciilin, sulfa-based antibiotic, latex, insect bites/stings

I had no idea on the first occasion that this could be severe - they were giving me the ampicillin form of the drug for tonsillitis when I broke out into what I thought was a rash all over. Strange and itchy feeling, but never understood it could have been anaphylaxis, or even what that was. When 3 doctors at the clinic suddenly came in to have a look, it was a clue this wasn't good.

Confess that because of that, the sulfa reaction and a reaction to one other drug, to this day I'm a bit wary of taking meds. Fortunately, am pretty healthy, haven't needed antibiotics much.

It took several surgeries before my son stopped needing constant antibiotics. some stopped working for him at all. Looking back, I couldn't have handled his condition differently. I don't like constantly having anyone on meds, and when possible prefer my kids to fight things off on their own. But his system couldn't. But, I also don't like constant surgeries....so we were constantly balancing the odds against each other.

_________________self: allergy to sesame seeds and peanuts
3 sons each with at least one of the following allergies: peniciilin, sulfa-based antibiotic, latex, insect bites/stings

My daughter who has no food allergies had a head to toe reaction to sulfa meds at about six years old and then the same type of reaction to penicillin at 16 when she had her wisdom teeth out. so allergic to both. Though we did tend to the reaction right away it lasted for days. When the reaction seemed to have gone (just) when we went on vacation to phoenix we had to stay out of the sun as the hives would come out again. Her system seemed to be very affected by the meds that she had almost taken the whole amount. Of course the reaction happens when you are on the second last day of the full amount.

_________________Me-Allergic to Peanut, Tree Nut, Coconut, Shellfish, ASA and Asthma
My Husband and Children No Allergies

Both my kids with the penicillin it was day 3 of the prescription. They started it on different days, so it was easy to know it was the peniciillin and not something else. And both, it was the first time they'd ever had penicillin.

With the one alleegic to sulfa based antibiotics.....I don't remember how long he was one them, but it was definitely NOT the first time he'd had it.

_________________self: allergy to sesame seeds and peanuts
3 sons each with at least one of the following allergies: peniciilin, sulfa-based antibiotic, latex, insect bites/stings

Though it took many days to have a reaction, I wonder, but dont want to test if the next time the reaction would be worse and quicker.
I have also been on penicillin may times through out my life but about two years ago went on it and YUP on the second to last day of the meds all over my body hives my legs were so itchy wanted to take the wire dog brush to them. I guess you can become allergic to anything at any age.

_________________Me-Allergic to Peanut, Tree Nut, Coconut, Shellfish, ASA and Asthma
My Husband and Children No Allergies

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